Chrome extension

[kaysixteen]

I happened recently to chance upon a web aggregator that has links to various sites offering 'complete classic movies' (some are not, ahem, anyone's def of 'classic movie'), for free.  Some are youtube and various other such places, but some movies I would perhaps want to stream are available on a site that tells me I would need to add 'Chrome extension' to my PC, in order to do so (they have a free link to get this extension).  It is free, but is it safe to do this?

[Parasaurolophus]

Generally, you should get software straight from whoever made it.

Free streaming sites are usually at least a little suspect.

But which extension is it?